The distribution of the flyers comes four days after Portland police issued a warning about a particularly potent heroin that has been circulating around the city. In the past eight weeks, police said two men had died from apparent heroin overdoses and another 11 people had been treated for overdoses that required lifesaving measures. Four overdoses occurred last week alone, police said.

The Portland Exchange and The Overdose Prevention Project, both programs with the Public Health Division, have received information that there are two types of potent heroin being sold in Portland, city spokeswoman Nicole Clegg said.

Both types of drugs have a higher risk of overdose, she said.

The flyers being distributed on Tuesday urge drug users and their friends to be aware of the higher chance of heroin overdose and offer ways to reduce the risk, such as not using drugs alone and avoiding mixing drugs.

Hillary Clinton did not have a State Department email account while she served as America's top diplomat, a senior state department official said Monday, and instead used a personal email account during her four years on the job.